Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8f89abe258bee1…

MALICIOUS

PDF

84.4 KB Created: 2021-09-22 10:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 792dde241349b1dcdacecf165426cf59 SHA-1: 7f3f63355a3148a21dff29695368017ab5d0a6e4 SHA-256: 3e8f89abe258bee1e7f2f504c0eb738c4e576915bed34c6fea22096747f86ca9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fetogram.com/images/upload/files/89818514312.pdf In PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/kexivexijatotirovebikiji.pdfIn PDF document text
    • https://sapporopools.com/contents/files/99483743815.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132bde7d1103---91283120203.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/liwusopivasuburedizepuvi.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/zebunof.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16148712e1117a---1615621546.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/sisisibibukofibedemexev.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/puniwulikemanu.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/malovenikulidazi.pdfIn PDF document text
    • https://patc.fr/imagesfile/71784552326.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902142441.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/83191931919.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/runuzuwizejule.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/kabidoduzizukifufival.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/dilenatorusufiramuju.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/lijalazekubezid.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/zamugurokizikurovememi.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/57335291828.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/90681866241.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25108360149.pdfIn PDF document text
    • http://synowka.pl/galeria/file/dolewovifaliral.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108311938297357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+fix+your+wifi+connection+on+your+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 10592 bytes
SHA-256: 6e1919dca65824a7858ec375b65e733d4c320a4853379634ab58e306066a0f80
font_01_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 18020 bytes
SHA-256: 02cd074f25ae1414c38b9b11a2ba37ba53789711d43b59a9d44cb23ac87305da
font_02_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1